www.murata-ps.com
UST Models
3W, Single Output DC/DC Converters
PRODUCT OVERVIEW
Rarely has a Series of low-power DC/DC
converters been defined by both low cost and
Murata Power Solutions' made-in-the-USA quality
and reliability. Our new UST Series of single-output
DC/DC’s achieves this best-of-both-worlds status
by implementing a proven circuit architecture
(170-200kHz flyback design) as a full, SMT-on-pcb
assembly (including surface-mount magnetics) that
is truly 100% automatically assembled. Packaged
in miniature 1.25" x 0.8", DIP-like plastic packages
(UL94V-0 rated) and requiring no external compo-
nents, UST Series DC/DC’s bring true component-
like convenience to designers of today’s distributed
power systems.
Output voltages are 5, 12 or 15 Volts. Input
voltage ranges are 4.5-9V ("D5" models), 9-18V
("D12" models) or an ultra-wide 18-72V ("D48"
models). UST DC/DC’s are fully isolated (1000Vdc
guaranteed) and include input (pi type) and output
filters within their package. Output transient
response is a quick 200µsec, while output ripple
and noise are typically 75mVp-p.
These rugged modules are fully encapsulated
with a thermally conductive potting compound that
contributes to their outstanding moisture/vibration
resistance and impressive MTBF. They operate over
the full –40 to +75°C temperature range without
derating. All models have been thoroughly charac-
terized (electrically, mechanically and thermally),
qualified (including HALT), and EMI/EMC tested.
Additionally, they are certified to UL1950, CSA 22.2
No. 950 and IEC950.
Murata Power Solutions' UST Model 3W DC/
DC’s are excellent selections for telecom/datacom,
computer and process-control applications demand-
ing small size, low cost and high reliability. If required,
their design "flexibility" allows for easy modification to
your application-specific requirements.
FEATURES
Lowest cost! Highest reliability!
100% SMT-on-pcb, including magnetics
100% automatically assembled
Standard "DIP" package and pinouts
isolated, 1000Vdc guaranteed
Fully
12 or 15 Volt outputs
5,
Choice of 3 wide-range inputs:
4.5-9 Volts
9-18 Volts
18-72 Volts
Guaranteed efficiencies to 73%
to +75°C full-power operation
–40
Internal input/output filtering
UL1950/C22.2 No. 950/IEC950 certified
cations and customs for OEM’s
Modifi
+V
IN
+V
OUT
COMMON
–V
IN
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
Figure 1. Simplified Block Diagram
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
MDC_UST_3W.E01
Page 1 of 4
UST Models
Performance Specifications and Ordering Guide
Output
Model
➄
UST-5/500-D12-C
UST-5/500-D48-C
UST-12/250-D12-C
UST-12/250-D48-C
UST-15/200-D12-C
UST-15/200-D48-C
UST-5/500-D5-C
UST-12/250-D5-C
UST-15/200-D5-C
➀
3W, Single Output DC/DC Converters
Input
Package
(Case,
Pinout)
C1, P1
C1, P1
C1, P1
C1, P1
C1, P1
C1, P1
C1, P1
C1, P1
C1, P1
V
OUT
(Volts)
5
5
12
12
15
15
5
12
15
I
OUT
(mA, Max.)
500
500
250
250
200
200
500
250
200
R/N (mVp-p)
➁
Typ.
Max.
75
75
75
75
75
75
75
75
75
120
120
150
150
150
150
120
150
150
Regulation (Max.)
➂
Line
Load
±0.2%
±0.2%
±0.5%
±0.5%
±0.5%
±0.5%
±0.2%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
V
IN
Nom.
(Volts)
12
48
12
48
12
48
5
5
5
Range
(Volts)
9-18
18-72
9-18
18-72
9-18
18-72
4.5-9
4.5-9
4.5-9
I
IN
➃
(mA)
25/282
7/69
25/338
8/81
25/333
8/81
18/676
30/800
30/800
Efficiency
Min.
Typ.
70%
71%
72%
73%
73%
73%
72%
73%
73%
74%
75%
74%
77%
75%
77%
74%
75%
75%
As of September 2014, ONLY the following part numbers will be available: UST-5/500-D12-C; UST-5/500-D48-C;
UST-12/250-D48-C; UST-15/200-D48-C
➀
➁
➂
➃
➄
PART NUMBER STRUCTURE
Typical at T
A
= +25°C under nominal line voltage and full-load conditions unless otherwise noted.
Ripple/Noise (R/N) measured over a 20MHz bandwidth.
10% to 100% load.
Nominal line voltage, no-load/full-load conditions.
These are not complete model numbers. Please refer to the part number structure when ordering.
MECHANICAL SPECIFICATIONS
1.25
(31.75)
U ST
-
5
/
500
-
D48
-
C
Output Configuration:
U
= Unipolar
Product Series
Nominal Output Voltage:
5, 12 or 15 Volts
Maximum Output Current
in mA
RoHS-6
compliant*
Input Voltage Range:
D5
= 4.5-9 Volts (5V nominal)
D12
= 9-18 Volts (12V nominal)
D48
= 18-72 Volts (48V nominal)
0.45
(11.43)
STANDOFFS
0.025
(0.64)
Case C1
0.020 ±0.002 DIA.
(0.508 ±0.051)
0.600
(15.24)
0.15 MIN
(3.81)
0.200
(5.08)
0.100
(2.54)
0.18
(4.57)
*
Contact Murata Power Solutions
for availability.
TEMPERATURE DERATING
3 4
7
8
0.600
(15.24)
1 2
5
6
0.80
(20.32)
Output Power vs. Ambient Temperature
V
IN
Nominal, Natural Convection
3.5
3
BOTTOM VIEW
PLASTIC CASE WITH AN INSULATED BASE
0.10
(2.54)
Output Power (Watts)
2.5
DIMENSIONS ARE IN INCHES (MM)
2
1.5
I/O Connections
Pin
1
2
3
4
5
6
7
8
Function P1
+Vin
+Vin
–Vin
–Vin
Common
+Vout
Common
+Vout
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
1
0.5
0
–40
0
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95 100
Ambient Temperature (
˚
C)
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
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MDC_UST_3W.E01
Page 2 of 4
UST Models
3W, Single Output DC/DC Converters
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions, unless noted.
➀
Input
Input Voltage Range:
"D5" Models
"D12" Models
"D48" Models
Input Current
Input Filter Type
➁
Reverse-Polarity Protection
V
OUT
Accuracy
(50% load)
Temperature Coefficient
Ripple/Noise
(20MHz BW)
➁
Line/Load Regulation
Efficiency
Isolation Voltage
➂
Short Circuit Protection:
➃
"D5" Models
"D12" and "D48" Models
Transient Response
(50% load step)
Switching Frequency:
"D48" Models
"D5" and "D12" Models
Operating Temperature
(Ambient, no derating)
Storage Temperature
Dimensions
Case Material
Pin Material
Weight
4.5-9 Volts (5V nominal)
9-18 Volts (12V nominal)
18-72 Volts (48V nominal)
See Ordering Guide
Pi
Yes (Instantaneous, 2A maximum)
Input Voltage:
"D5" Models
"D12" Models
"D48" Models
Absolute Maximum Ratings
12 Volts
20 Volts
80 Volts
Current must be <2A. Brief duration
only. Fusing recommended.
None
Maximum current and short-circuit
duration are model dependent. "D12"
and "D48" models can withstand
sustained output short circuits.
–55 to +100°C
+280°C
Input Reverse-Polarity Protection
Output Overvoltage Protection
Output Current
Output
±1%, maximum
±0.02% per °C
See Ordering Guide
See Ordering Guide
See Ordering Guide
1000Vdc, minimum
Power-limiting technique, auto-recovery
Hiccup technique, auto-recovery
200µsec to ±1.5% of final value
200kHz
170kHz
Storage Temperature
Lead Temperature
(soldering, 10 sec.)
These are stress ratings. Exposure of devices to greater than any of these conditions
may adversely affect long-term reliability. Proper operation under conditions other than
those listed in the Performance/Functional Specifications Table is not implied.
Dynamic Characteristics
TECHNICAL NOTES
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "floating."
Users may ground either the Common (pins 5 and 7) for normal usage or
the positive side (+Output, pins 6 and 8) to effectively reverse the output
polarity.
Filtering and Noise Reduction
All UST 3 Watt DC/DC Converters achieve their rated ripple and noise
specifications without the use of external input/output capacitors. In criti-
cal applications, input/output ripple and noise may be further reduced by
installing electrolytic capacitors across the input terminals and/or low-ESR
tantalum or electrolytic capacitors across the output terminals. The caps
should be located as close to the power converters as possible. Typical
values are listed in the tables below. In many applications, using values
greater than those listed will yield better results.
To Reduce Input Ripple
"D5" Models
"D12" Models
"D48" Models
To Reduce Output Ripple
5V Outputs
12/15V Outputs
47µF, 15V
10µF, 35V
4.7µF, 100V
47µF, 10V, Low ESR
22µF, 20V, Low ESR
Environmental
–40 to +75°C
–40 to +100°C
Physical
1.25" x 0.8" x 0.45" (31.8 x 20.3 x 11.4mm)
Diallyl phthalate, UL94V-0-rated
Gold-plated copper alloy w/nickel underplate
0.5 ounces (14.2 grams)
➀
These power converters require a minimum 10% loading to maintain specified regulation.
Operation under no-load conditions will not damage these devices; however, they may not
meet all listed specifications.
➁
Application-specific internal input/output filtering can be recommended for quantity orders
and perhaps added internally upon request. Contact Murata Power Solutions Applications
Engineering for details.
➂
Devices can be screened for quantity orders or modified for higher guaranteed isolation
voltages. Contact Murata Power Solutions Applications Engineering for details.
➃
The current limit inception point is dependent on the input voltage. Therefore, it is possible
to draw current beyond the rated capacity. Users should fully characterize their load condi-
tions.
In critical, space-sensitive applications, Murata Power Solutions may be able
to tailor the internal input/output filtering of these units to meet your specific
requirements. Contact our Applications Engineering Group for additional
details.
www.murata-ps.com/support
MDC_UST_3W.E01
Page 3 of 4
UST Models
3W, Single Output DC/DC Converters
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. For Murata Power
Solutions UST 3 Watt DC/DC Converters, you should use fast-blow type
fuses with values
no greater than the following:
V
IN
Range
"D5"
"D12"
"D48"
Fuse Value
1.5A
1A
0.5A
EMI RADIATED EMISSIONS
If you’re designing with EMC in mind, please note that all of Murata Power
Solutions' ST 3 Watt DC/DC Converters have been characterized for radi-
ated and conducted emissions in our new EMI/EMC laboratory. Testing is
conducted in an EMCO 5305 GTEM test cell utilizing EMCO automated EMC
test software. Radiated emissions are tested to the limits of FCC Part 15,
Class B and CISPR 22 (EN 55022), Class B. Correlation to other specifica-
tions can be supplied upon request. Radiated emissions plots to FCC and
CISPR 22 for model UST-5/500-D48 appear below.
CUSTOM CAPABILITIES
Murata Power Solutions' world-class design, development and manu-
facturing team stands ready to work with you to deliver the exact power
converter you need for your demanding, large volume, OEM applications.
And ... we’ll do it on time and within budget!
Our experienced applications and design staffs; quick-turn prototype
capability; highly automated, SMT assembly facilities; and in-line SPC
quality-control techniques combine to give us the unique ability to design
and deliver any quantity of power converters to the highest standards of
quality and reliability.
We have compiled a large library of DC/DC designs that are currently used
in a variety of telecom, medical, computer, railway, aerospace and indus-
trial applications. We may already have the converter you need.
Contact us. Our goal is to provide you the highest-quality, most cost-
effective power converters available.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following
operating requirements
and the
Life and Safety Critical Application Sales Policy:
Refer to:
http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2015 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_UST_3W.E01
Page 4 of 4
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